Avant-garde jazz (also known as avant-jazz) is a style of music and improvisation that combines avant-garde art music and composition with jazz. Avant-jazz often sounds very similar to free jazz, but differs in that, despite its distinct departure from traditional harmony, it has a predetermined structure over which improvisation may take place. This structure may be composed note for note in advance, partially or even completely. - Text from: Wikipedia-Avante-Garde Jazz
John Coltrane's increasingly experimental work, and the Impulse!
label became the flagbearers of the avant-garde jazz scene. Musicians
associated with this high-volume variety of avant-garde jazz (sometimes
referred to as "fire music") included Archie Shepp, Albert Ayler, McCoy Tyner, Don Cherry, Pharaoh Sanders, and Alice Coltrane.
Some of these musicians also began to take on an oppositional
relationship to the mainstream music industry, preferring to release
records themselves through independent labels such as ESP-Disk. - Text from: Wikipedia-Avante-Garde Jazz
The 1970s saw the development of jazz fusion. It is questionable whether this can be considered a form of avant-garde jazz, though Miles Davis's recordings of this period, in particular, appear quite innovative and take inspiration from serialism and aleatoric music, just as the AACM did. In any case, hardcore jazz fans
tended to regard early jazz fusion as a commercial sell-out move.
However, by the early-to-mid-1970s, many free jazz icons, such as Albert Ayler, Archie Shepp, and Ornette Coleman were experimenting with rock and funk. Coleman would eventually develop the free funk style, which would be further explored by the M-Base musicians in the 1980s. - Text from: Wikipedia-Avante-Garde Jazz
John Zorn, in particular, became an iconic figure in the "downtown" music scene, performing in free jazz, free improvisation, and a variety of rock and extreme music styles. Many of these musicians actually resided in Brooklyn; Tim Berne is a prominent representative. - Text from: Wikipedia-Avante-Garde Jazz
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